python attrs_Python attrs作用是什么?

from rest_framework import serializers

class CommentSerializer(serializers.Serializer):

email = serializers.EmailField()

content = serializers.CharField(max_length=200)

created = serializers.DateTimeField()

def restore_object(self, attrs, instance=None):

“””

Given a dictionary of deserialized field values, either update

an existing model instance, or create a new model instance.

“””

if instance is not None:

instance.email = attrs.get(’email’, instance.email)

instance.content = attrs.get(‘content’, instance.content)

instance.created = attrs.get(‘created’, instance.created)

return instance

return Comment(**attrs)

比如，这其中的attrs是？

这是python的参数列表，两个星号是可变参数。

restore_object接收到的attrs参数是dict类型，传递到Comment函数的时候前面加两个星号转成可变参数列表。

比如attrs = {‘a’:1, ‘b’:2}

Comment函数实际的调用会变成：Comment(a=1, b=2)

attr 是函数的参数 具体是啥要看你自己的定义了

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